Better debug message

rth · rth · commit f74f3d779150 · 2018-07-14T23:52:43.000-05:00
diff --git a/lib/matplotlib/path.py b/lib/matplotlib/path.py
@@ -127,7 +127,8 @@ def __init__(self, vertices, codes=None, _interpolation_steps=1,
         vertices = _to_unmasked_float_array(vertices)
         if vertices.ndim != 2 or vertices.shape[1] != 2:
             raise ValueError(
-                "'vertices' must be a 2D list or array with shape Nx2")
+                "'vertices' must be a 2D list or array with shape Nx2, "
+                "while provided vertices.shape={}.".format(vertices.shape))
 
         if codes is not None:
             codes = np.asarray(codes, self.code_type)
